Schools and the subway system remained closed Tuesday as Brussels, Belgium, remained under tight security while authorities tried to find the key suspect in the November 13 Paris attacks.
ບຣັສເຊີລ ຍັງຢູ່ໃນສະພາບ ລະມັດລະວັງ

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With the city at its highest state of alert, the streets of Brussels, normally packed with tourists, were quiet, Nov. 24, 2015.

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Soldiers are expected to stay on the streets of Brussels throughout the week despite the government's promise of a return to normalcy beginning Wednesday. Photo taken Nov. 24, 2015.

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Despite remaining at the highest security alert levels, Brussels prepares for its annual Christmas markets, Nov. 24, 2015.